Instrument for supplying comminuted gold by air-pressure



F. J. MUSPRATT INSTRUMENT {on SUPPLYING commmurso sou) BY AIR PRESSURE.

APPLICATION FILED JAN. 3, I920.

Patented Nov. 29, 1921.

; ToaZZ whom it mdy cohcern; w

UNITED FREDERIG Jmnsivrusrnetrr or trowlvsnrr or WIOOM'BYEQ QUEENSLAND,A STRAL A.

om n.

INSTRUMENT roR'sUrrLYING COMMINUTEDVGOLD BY Arn-rnnssunn.

' App1icati0n filed Ja ua y 3, 192,9. s ri ifisiaf aie a4,

Be it known that I, FRE' Euro PRATT, a citizen of the Commonwealth ofAustralia, residing at Fa rlles plantatlon, township of Woombye, 1n theState of Queensland, and continent of Australia, have invented a new anduseful Instrument for Supplying Comminuted Giroldby Air-Fressure, ofwhich the following is a specification.

My invention consists of a machine for filling teeth and crown andbridge building by driving particles of gold with great force by meansof compressed an: into the prepared cavity of the tooth for filling oragalnst the prepared stump of the tooth for crown building or againstthe gold wlre for bridge building.

I attain the objects of my inventlon by the mechanism illustrated in theaccompanying drawings, in which- I Figure 1 is a side elevatlon of theinvention;

Fig. 2 is a longitudinal section thereof,

partly in elevation; I Fig. 3 is a transverse sectlon through the valveon line 33 of Fig. 2; and

Fig. 4 is a side elevation of an alternative form of nozzle.

Like numerals refer to like parts throughout the several views. 7Referring to the accompanying drawings, I provide a handle 1 to which isattached a flexible tube 2 at 3 opening into air channel 4. The handle 1is provided with a valve chamber 12, in which is slidably mounted asuitable valve 5 having an opening therethrough which may be moved intoand out of registration with the channel 4. I provide a cylindricalchamber 6 into which channel 4 opens. I provide a paddle wheel? having ahub 8 mounted in the opposite sides or covers of the chamber 6. Chamber6 has a mouth 9 to which any suitable nozzle such as member 10 or 19 issuitablIy attached, as at 11, as shown in Fig. 2. provide a bell crank16 attached by pivot 17 to the valve 5 for operating said valve. Theother end of the bell crank is pivotally attached to a trigger 14, whichis mounted by means of pivot 15 in handle 1, as shown in Fig. 2. I alsoprovide a suitable guard member 21 for the trigger 14.. Trigger 14 andvalve 5 are normally held in retracted position, with the valve closingthe air channel 4 to prevent the flow of compressed air Specification ofLetters'latent. iPatented JAM S Mus I .also provide a suitabl'efia'dmission .nozzlef'and slotted rotatable cap 8f'fo Y theemovable oover. 20 of the cylindrical chamber 6.

To operate the device compressed air is admitted through flexible tube 2and channel 4 in handle 1. The trigger 14 is pulled, thus lowering Valve5 so that the opening in the valve will register with the air channeland allow the compressed air to flow into the chamber 6, thus rotatingthe paddle wheel 7 and causing the particles of gold or other metal inthe chamber to be stirred up and driven through the mouth 9 and nozzle10 into the cavity of the tooth, or against the prepared stump, oragainst the gold wire foundation, as may be required in the par ticulardental operation to be performed.

The chamber and nozzle of the instrument may be constructed of glass orany suitable material to which gold will not readily adhere.

What I claim is:

combination of a handle having an air channel extending therethrough,flexible means for admitting compressed air to said channel, a valve inthe path of said channel, manually operable means for 1 opening thevalve to allow air to flow therethrough, a cylindrical chamber intowhich the air channel'opens,

a rotatable paddle wheel mounted in said chamber, a mouth for theoutflow of air charged with the particles of gold or other material usedin dental work from said 1. In a dental surgical instrument, the

chamber, and a nozzle of the required shape attached to the aforesaidmouth.

2. In a dental surgical instrument of the class described, thecombination of a handle member having an air channel therethrough,

a valve chamber in the path of the air channel, a valve slidably mountedin said chamber; a'bell crank attached to said valve, a triggeroperatively attached to the bell crank, a spring normally holding thetrigger and Valve in retracted position to close the air passage, achamber for the particles of filling metal, into which said air channelopens, a paddle wheel rotatably mounted in said chamber, the chamberhaving a month,

and a nozzle attached to said mouth, sub- 7 Y stantially as described.

3. In combination with the apparatus described in claim 2, a removablecover plate for the chamber in which the paddle wheel is mounted, and afilling nozzle on said cover plate for the insertion of particles of thefilling metals therethrough Without removing the cover plate,substantially as described. y, c

V 4. In a device'of the class described, the

combination of a curved handle having an air channel extendingtherethrough, a valve positioned in the path ofsaid' channel, mane:

ally operated means for opening the valve, said" means including aspring normally holding the valve in closed position, a shortcylindrical chamber into which the'airchannel opens, a rotatable paddleWheel in said chamber, a discharge nozzle with which said cylindricalchamber is in communication, the cylindrical chamber having a capmounted .onhthe cover thereof for the admission of particles of metalused in dental WorkWithout removing the cover, and a guard memberextending from thecylindrical chamber to the handle and protectingthemanually operated trigger means for controlling the valve abovedescribed j FREDER IC J MUSPRATT.

